001package org.apache.maven.toolchain.merge; 002 003/* 004 * Licensed to the Apache Software Foundation (ASF) under one 005 * or more contributor license agreements. See the NOTICE file 006 * distributed with this work for additional information 007 * regarding copyright ownership. The ASF licenses this file 008 * to you under the Apache License, Version 2.0 (the 009 * "License"); you may not use this file except in compliance 010 * with the License. You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, 015 * software distributed under the License is distributed on an 016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 017 * KIND, either express or implied. See the License for the 018 * specific language governing permissions and limitations 019 * under the License. 020 */ 021 022import java.util.LinkedHashMap; 023import java.util.List; 024import java.util.Map; 025 026import org.apache.maven.toolchain.model.PersistedToolchains; 027import org.apache.maven.toolchain.model.ToolchainModel; 028import org.codehaus.plexus.util.xml.Xpp3Dom; 029 030/** 031 * 032 * @author Robert Scholte 033 * @since 3.2.4 034 */ 035public class MavenToolchainMerger 036{ 037 038 public void merge( PersistedToolchains dominant, PersistedToolchains recessive, String recessiveSourceLevel ) 039 { 040 if ( dominant == null || recessive == null ) 041 { 042 return; 043 } 044 045 recessive.setSourceLevel( recessiveSourceLevel ); 046 047 shallowMerge( dominant.getToolchains(), recessive.getToolchains(), recessiveSourceLevel ); 048 } 049 050 private void shallowMerge( List<ToolchainModel> dominant, List<ToolchainModel> recessive, 051 String recessiveSourceLevel ) 052 { 053 Map<Object, ToolchainModel> merged = new LinkedHashMap<Object, ToolchainModel>(); 054 055 for ( ToolchainModel dominantModel : dominant ) 056 { 057 Object key = getToolchainModelKey( dominantModel ); 058 059 merged.put( key, dominantModel ); 060 } 061 062 for ( ToolchainModel recessiveModel : recessive ) 063 { 064 Object key = getToolchainModelKey( recessiveModel ); 065 066 ToolchainModel dominantModel = merged.get( key ); 067 if ( dominantModel == null ) 068 { 069 recessiveModel.setSourceLevel( recessiveSourceLevel ); 070 dominant.add( recessiveModel ); 071 } 072 else 073 { 074 mergeToolchainModel_Configuration( dominantModel, recessiveModel ); 075 } 076 } 077 } 078 079 protected void mergeToolchainModel_Configuration( ToolchainModel target, 080 ToolchainModel source ) 081 { 082 Xpp3Dom src = (Xpp3Dom) source.getConfiguration(); 083 if ( src != null ) 084 { 085 Xpp3Dom tgt = (Xpp3Dom) target.getConfiguration(); 086 if ( tgt == null ) 087 { 088 tgt = Xpp3Dom.mergeXpp3Dom( new Xpp3Dom( src ), tgt ); 089 } 090 else 091 { 092 tgt = Xpp3Dom.mergeXpp3Dom( tgt, src ); 093 } 094 target.setConfiguration( tgt ); 095 } 096 } 097 098 protected Object getToolchainModelKey( ToolchainModel model ) 099 { 100 return model; 101 } 102 103}